Question about Chevrolet Blazer

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2000 blazer recharged ac 2 weeks ago held vacuum for 30+ min now no leaks blws cold then hot cold then hot what next compressor or evaporator replace???

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  • psiwan Jun 14, 2010

    thanks will try

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1 Answer

First thing to try out is to recalibrate the temperature blend door. Try disconnecting the battery for 10-15 minutes and reconnecting it, then turning the key to the ON position until you do not hear any more noises from the glove box area. Next thing to try out is to disconnect the HVAC control module with the key in the ON position, leave it disconnected for 10-15 minutes (turn your truck off), then plug it back in with the key in the ON position. If that does not work then you will need to replace your temperature blend door actuator

Posted on Jun 07, 2010

  • psiwan Jun 07, 2010

    Thanks could you tell me the location of the HVAC control module??........thanks again

  • psiwan Jun 07, 2010

    Also could you telll me how to replace the blend door and location thanks

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After recharging my ac with freon it still doesn't blow cold air in my 02malibu ls what's next?


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Where can I find the low port to recharge my AC on my 2000 chevy blazer


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Thanks for using FixYa. Good luck.

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98 buick century AC blows cold air on passenger side and hot air on drivers side..when we recharged the unit, it worked cold air for a few days and now blowing hot air again.


Hi. There seems to be a blockage within the system. I will list all parts to be checked by your mechanical. I would also have the blend door linkages or servos inspected for fail points along with the listed areas of concern, below:

Loose or broken drive belt
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Instruct your mechanic to check all the above, along with the dash blend door linkages for faults.

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HI. Here is a complete check list that will help you trouble shot thsi issue. You will find the problem in one or more of these areas stated below.

1. Check Drive Belts - The air conditioner utilizes a drive belt that supplies power to rotate the compressor, which is basically a refrigerant pump. If the belt fails the compressor has nothing to drive it, inspect and replace as needed to restore operation. If belt is intact proceed to the next step.

2. Check for Compressor Clutch Engagement - Turn the air conditioner to the "on" position and set controls to the coldest setting. Start the engine and allow to idle. Then open the hood and inspect the clutch at the front of the compressor, is it turning? "Engaged" if so, the system has enough refrigerant to activate. If the system is low on refrigerant it will not work properly. In this case an air conditioner recharge kit is needed to recharge the system. If the system is low on refrigerant it could cycle on and off, making a ticking noise. If the compressor clutch is not turning proceed to next step.

3. Inspect for Refrigerant Leaks - If the system has a large leak and no refrigerant remains it will not activate. First test system for a static pressure charge, with the engine off attach an ac gauge to the low side pressure port and check the state of charge. Depending on outside temperature there should be between 50 psi and 80 psi. (Cool and warm). A refrigerant leak detector is needed to inspect for leak, but if you do not have a leak detector there is an alternative method. The air conditioner system is designed to run with oil suspended in the refrigerant to lubricate the system. Check for oily residue outside the system by inspecting all hoses, compressor, condenser, evaporator or receiver drier and replace any component that has failed.

4. Inspect Fuses - Check under dash panel and under hood power distribution center. Replace failed fuses as needed, recheck system. If the new fuse fails when reinstalled a short circuit is present and requires diagnosing with a wiring schematic, follow circuits to locate short, repair as needed and recheck system.

5. Check Temperature Control Vents - The vents inside your car are controlled by a cable, electrical servo or vacuum servo. If the temperature blend door is not functioning properly it will cause warm air from the heater to exit the vents. To check this start the car and allow the engine idle, next turn the blower motor speed on low, switch the temperature control from warm to cold while your ear is close to the vents. You should hear the door move inside the heater box as it swings from open to close. If not, insect for a vacuum leak or a shorted motor in the servo, repair the leak or replace the servo motor.

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1 Answer

Service port


It seems that you have a leak, best bet is to bring it to someone with a set of gages to check the pressures while the ac system is operating. The high side should be about 150-200 psi and low side between 30-40psi with those numbers you should be running very cool. If its not that high then you most probably have a leak in the system most probably at one of the recently replaced parts or a new place, fill the system with a uv dye and recharge. drive for a week or two and check with a uv light.

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A.C.


HI. Here is a complete check list that will help you trouble shot this issue. You will find the problem in one or more of these areas stated below.

1. Check Drive Belts - The air conditioner utilizes a drive belt that supplies power to rotate the compressor, which is basically a refrigerant pump. If the belt fails the compressor has nothing to drive it, inspect and replace as needed to restore operation. If belt is intact proceed to the next step.

2. Check for Compressor Clutch Engagement - Turn the air conditioner to the "on" position and set controls to the coldest setting. Start the engine and allow to idle. Then open the hood and inspect the clutch at the front of the compressor, is it turning? "Engaged" if so, the system has enough refrigerant to activate. If the system is low on refrigerant it will not work properly. In this case an air conditioner recharge kit is needed to recharge the system. If the system is low on refrigerant it could cycle on and off, making a ticking noise. If the compressor clutch is not turning proceed to next step.

3. Inspect for Refrigerant Leaks - If the system has a large leak and no refrigerant remains it will not activate. First test system for a static pressure charge, with the engine off attach an ac gauge to the low side pressure port and check the state of charge. Depending on outside temperature there should be between 50 psi and 80 psi. (Cool and warm). A refrigerant leak detector is needed to inspect for leak, but if you do not have a leak detector there is an alternative method. The air conditioner system is designed to run with oil suspended in the refrigerant to lubricate the system. Check for oily residue outside the system by inspecting all hoses, compressor, condenser, evaporator or receiver drier and replace any component that has failed.

4. Inspect Fuses - Check under dash panel and under hood power distribution center. Replace failed fuses as needed, recheck system. If the new fuse fails when reinstalled a short circuit is present and requires diagnosing with a wiring schematic, follow circuits to locate short, repair as needed and recheck system.

5. Check Temperature Control Vents - The vents inside your car are controlled by a cable, electrical servo or vacuum servo. If the temperature blend door is not functioning properly it will cause warm air from the heater to exit the vents. To check this start the car and allow the engine idle, next turn the blower motor speed on low, switch the temperature control from warm to cold while your ear is close to the vents. You should hear the door move inside the heater box as it swings from open to close. If not, insect for a vacuum leak or a shorted motor in the servo, repair the leak or replace the servo motor.

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1 Answer

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